The young Magpies fell behind to Tyrese Dyce’s first-half opener, however fought back after the break to earn three points.
Jay Turner-Cooke put United level against his former club before Adam Wilson quickly turned the game on its head before the hour-mark.
Back-to-back wins against Middlesbrough and now the Black Cats has lifted Newcastle up to 4th in the Premier League 2 Group 2 table.
Our writer Jordan Cronin was on Wearside – and here’s how he rated each Magpies player:
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9. Joe White - 8
At the heart of Newcastle’s attacking play. Looked a class above as he provided the assists to both of Newcastle’s goals. Cool and calm in possession. Photo: Michael Regan
10. Adam Wilson - 7
Emphatically fired Newcastle ahead just before the hour-mark after bursting forward to receive White’s brilliantly timed pass. Photo: Frank Reid
11. Dylan Stephenson - 6
Constantly ran in behind, a trait that has seen him hit eight goals already this season. Almost a ninth in the closing stage of the first-half. Photo: Frank Reid
12. Rosaire Longelo (on for Wilson, 75) - 5
Provided plenty of energy on the left-hand side as his team survived late Sunderland pressure. Photo: Tom Banks